Process of producing elastic and scented rubber sheeting.



UNITED STATES PATENT OFFICE.

WILLIAM F. A. SOHRADER, or BROOKLYN, NEW roRnjAssieuoR'ro TRAUN RUBBERco, OF COLLEGE POINT, NEW YORK, A ooRro- RATION .OF NEW JERSEY.

PROCESS OF PRODUCING ELASTIC AND SCENTED RUBBERSHEETINQ,

Specification of Letters Patent.

Patented une "5, 1906.

Application filed September 22. 1904. Serial No. 226.468:

To all whom it may concern:

Be it known that I, WILLIAM F. A. SoHRA- DER, a citizen of the UnitedStates of America, and a resident of Brooklyn, county of Kings, State ofNew York, have invented certain new and useful Improvements in which isperfumed or scented, and thereby.

caused to be fragrant, having then an agree: able odor which is emittedduring the use of same.

. By my novel process of making the scented rubber goods perfumes arecompounded or lncorporated with the rubber mass and form a constantcomponent of same, being dis tributed throughout the entire mass. Theperfumes are incorporated with the mass during the early stage of theprocess. They are employed in powdered form and ad-' mixed in such amanner that the fragrance of sameis retained during and after the procesof vulcanization.

My novel process of incorporating solid perfumesin powdered forms isparticularly devised for the production of thin and highlyscentedelastic sheeting which is used by dentists for rubber dams and in ladiesdressshie lds. Such rubber sheeting is very elastic and tough, and solidperfumes only can be used in its'manufacture, because the sheetingconsists of pure rubber. For making highly-elastic goods resins or gumswhich may occur in the raw rubber have to be washed out, so that solelypure rubber remains. Oils and moist substances are occasionally employedin hard-rubber compounds which are used for insulation and otherpurposes. Such hard-rubber com ounds also containoxid of zinc, whiting,'c., and the presence of oils in solid molded goods of that descriptiondoes not do any harm. Likewise, gum-benzoin has been used as a comonentin gum compounds used in the manua'cture ofvulcanizedcloth. Thisgum-benacid, and essential oil, which latter impairsthe good qualitiesof this elastic rubber sheeting, as it makes same porous and spongy.Gumbenzoin, further, is not awe'll-defined chemical substance of uniformconstitution. It is" a mixture of numerous substances and varies inquality and composition. Therefore it cannot be used for manufacturingthin and highly-elastic rubber-dam sheeting,-

because no uniform product. can be produced thereby and, owing to the,fact that it conzoin contains resinous substances, benzoic tains oils,it makes such goods porous and spongy As is well known, a disagreeableodor is emitted from rubber goods manufactured.

according to the processes heretofore known to the art. with rubbersheeting employed for maklng the so'called "rubber dams, which areforced around a tooth, so as to keep the saliva from the cavity undertreatment. noxious odor which issues from the former kind of rubber damswhile in the mouth of the patient makes the treatment of teeth veryunpleasant. I of my scentedrubbersheeting emit a mild and agreeable odorof perfume during the treatment of the tooth. Likewise a disagreeableodor issues fromdress-shields when the impervious rubber sheets formingpart of same become warm bythe heatof the humanbody. However, when thedress shields are provided with impervious layers made of my scentedrubber sheeting then an odor of perfume is perceptible.

The perfumes employed in this process do 7 not impair the usual goodqualities of the rubber. Any perfume obtainable in pow-v dered form maybe used. Such substances are, for instance, heliotropin, cumarin, andnerolin. These substances are crystalline and may be easily reduced topowder.

.The percentage of perfume introduced into the rubber mass depends onthe strength of the particular substance employed. How- This isparticularly the case" These dams when made The obever, a smallpercentage of perfume answers all ractical purposes. v

n carrying my invention into practice I substantially roceed as follows:Raw rubber is well washe then thoroughly cleaned and completely'dried inthe usual manner. The well-dried material is then ground in arubher-mill. Now the perfume in powdered form is compounded orincorporated with the ground-rubber mass either by grinding togetherthe'rubber mass and the perfume powder or in any other suitable manner.The product thus obtained is then calendered until it has the desiredthickness. The rubber sheeting produced by calendering is now vulcanizedin the usual manner, after which treatment the goods are finished andready for sale and use. a

The agreeable odor of perfume is not expelled during the process ofvulcanizing the goods and same remain fragrant. This *quality makes thegoods adapted for use in.

any instance where an agreeable odor is desirable. i

In the described manner I have provided scented rubber sheeting by mynovel process which may be employed in any instance where the use of theformer unscented goods are unpleasant and undesirable.

f n-T 1 y y 822,309

Having thus described my inyention, I

"claim as new and desire to secure by Letters Patent- 1. The process ofproducing thin, scented rubber-dam sheeting consisting in incorporatingwith pure ground rubber solid perfumes of uniform chemical constitutionin powdered form, calendering the product thus obtained until it has thethickness of fine rubber-dam sheeting, and vulcanizing same.

2. The process of producing scented rubber-dam sheeting consisting inincorporating with the pure ground rubber crystallized perfumes inpowdered form, calendering the product thus obtained until it has thethickness of rubber-dam sheeting and vulcanizing eme- Signed at NewYork, N. Y. this 21st day of September, 1904:.

WILLIAM F. A. SCHRADER. -Witnesses:

NICHOLA S CELIA, HATTIE B. LUEDERS.

